20607891 has 8 divisors (see below), whose sum is σ = 27582720. Its totient is φ = 13685832.

The previous prime is 20607889. The next prime is 20607907. The reversal of 20607891 is 19870602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20607891 - 2¹ = 20607889 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20607841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12271 + ... + 13848.

It is an arithmetic number, because the mean of its divisors is an integer number (3447840).

Almost surely, 2^20607891 is an apocalyptic number.

20607891 is a deficient number, since it is larger than the sum of its proper divisors (6974829).

20607891 is a wasteful number, since it uses less digits than its factorization.

20607891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26385.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20607891 is about 4539.5915014459. The cubic root of 20607891 is about 274.1644767006.

The spelling of 20607891 in words is "twenty million, six hundred seven thousand, eight hundred ninety-one".